Swaddle
You hear your baby cry out on the monitor, run in, and find them still asleep. Crying in sleep is common, especially in the first year, and most of the time it does not mean anything is wrong.
Why babies cry while asleep
- Active sleep. Young babies spend about half their sleep in active, REM-like sleep. Their eyes flicker, they twitch, grunt, smile, whimper and sometimes cry, all while asleep.
- Between sleep cycles. At the end of each cycle there is a brief, light phase. Babies may cry out, stir and then drift back into the next cycle.
- Big days. New skills and busy days can mean more restless sleep.
- Discomfort. Teething, a wet diaper, being too hot or cold, or gas can make sleep restless.
- Night terrors (toddlers). From around 18 months, some children scream or thrash while still deeply asleep, usually in the first few hours of the night, and do not remember it.
Should you go in?
A good approach is pause, listen, then decide:
- Wait a minute or two (unless the cry sounds like pain or distress).
- Listen: is it fading, steady or building?
- If it fades, your baby is probably resettling between cycles.
- If it builds, or your baby is clearly awake, go to them. Young babies often need a feed or help to settle.
Rushing in at every whimper can sometimes wake a baby who would have gone back to sleep. But responding is never wrong, especially for young babies.
When it might be something else
Call your pediatrician if crying in sleep comes with:
- Fever, vomiting, or a rash
- Noisy breathing, snoring with pauses, or gasping
- Pulling at the ears with fussiness, or signs of pain
- Fewer wet diapers or poor feeding
- A cry that sounds very different from usual
Trust your instincts. You know your baby’s cries.